[Qemu-devel] [PATCH v4 3/7] tcg/aarch64: Use ADR in tcg_out_movi

[Richard Henderson <rth@twiddle.net>]

The new placement of the TB means that we can use one insn
to load the return value for exit_tb returning the TB pointer.
---
 tcg/aarch64/tcg-target.inc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c
index 5f18545..1fa3bcc 100644
--- a/tcg/aarch64/tcg-target.inc.c
+++ b/tcg/aarch64/tcg-target.inc.c
@@ -616,7 +616,12 @@ static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
     /* Look for host pointer values within 4G of the PC.  This happens
        often when loading pointers to QEMU's own data structures.  */
     if (type == TCG_TYPE_I64) {
-        tcg_target_long disp = (value >> 12) - ((intptr_t)s->code_ptr >> 12);
+        tcg_target_long disp = value - (intptr_t)s->code_ptr;
+        if (disp == sextract64(disp, 0, 21)) {
+            tcg_out_insn(s, 3406, ADR, rd, disp);
+            return;
+        }
+        disp = (value >> 12) - ((intptr_t)s->code_ptr >> 12);
         if (disp == sextract64(disp, 0, 21)) {
             tcg_out_insn(s, 3406, ADRP, rd, disp);
             if (value & 0xfff) {
-- 
2.9.4